James wool



J. WOOL.

Drop Hammer. No. 77,155. Patented April 21, 1868.

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JAMES WOOL. OF BOSTON, MASSACHUSETTS, ASSIGNOR TO HIMSELF AND F. HUN NEWELL, OF SAME PLACE.

Letters Patent No. 77,155, dated April 21, 1868.

- IMPROVEMENT IN DROP-HAMMER,

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, JAMEs WOOL, of Boston, in the county of Suffolk, and State of Massachusetts, have invented an Improvement in Drops; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is adcscription of my invention sufiicien't to enable those skilled in the artto practise it.

In that class of machines known as drops, in which heavy weights are somewhat slowly lifted, and then allowed to fall under the influence of gravity, for the purpose of forging, swaging, &c., the weight in each of such machines has been connected to and lifted by a belt or strip of leather, sometimes of more than one thick mess, the belt being operated upon by the action of two revolving rollers, by being pinched between them, so that by the rotation of said rollers the belt was fed upward by their conjoined action, from which it was relieved by separation of the two rollers.

There have been some difiiculties attending the use of leather belts to elevate drop-weights. It is diflicult to get the belt of uniform thickness, so as to have the rolls act uniformly thereupon. Even when uniformityof thickness is obtained in the construction of a new belt, it cannot be maintained, as leather is not of uniform density, and consequently stretches'in its softest parts, and there grows thin, while the pressure of the rolls acts to condense and make thin the softest parts of the leather. At these soft and thin parts of a leather belt, the rollers are apt to slip, thus reducing the thin parts still more by abrasive action.

Whileleathcr belts are thus subject to rapid destruction when used with drop-weights, as described, they are very expensive, both as regards'first cost and repairs, and the object of my invention is tov produce a substitute for such belts at a less first cost, which shall be more efiicient for the. purpose than are belts of leather, and more durable. I

My invention consists in the employment, with lifting-rollers and 'a drop-weight, of a lifter, which has a central body of wood, faced on both sides with leather.

A lifter so constructed has the advantage of leather surfaces fortheaction thereupon 0f the rollers; it is easily reduced, in-the process of its manufacture, to a-uniform thickness, the body of wood cannot be elongated by the stretch of the weight or the pressure of the rolls, andthere is not enough thickness of leather in the composite structure to render any variation in its density appreciable.

Wood alone will not answer the purpose, as its surface will glaze under the action of the rolls, which will then slip and abrade. My invention, by combining the qualities of the wood and the leather, gets from each material the desirable qualities which they'possess for the purpose, and practical experience with my improved lifters has confirmed the theory of their action. I k

The drawing shows in side elevation a drop," in which my invention is embodied.

a is the weight; b, the anvil; c, the guide-frame for the weight; d, the rollers, which move at-uniform surface velocity, being of the same size, and uniformly geared together. 'These rolls are arranged so that one can have its axismoved toward and from the axis of the other, the bearings of one roll being made movable through the lever e, which is so located as to be subject to the manipulations of the operator. p

The lifter of the weight is made of a central body of wood, j, which is covered or venecred, on both broad surfaces, with a thin coating of leather, g, theleather and wood being united by any suitable cement, and, if

deemed desirable, the leather may be still further secured by the use of pegs of wood.

The lifter is securely clamped to tho weight between angle-pieces, it, of metal, and if it is desired to cushion the lifter against the effect of its own inertia in falling, rubber may be packed between the end of the lifter and the weight. g p i I claim, in combination with the weight and lifting-rollcrs of a drop-hammer, a lifter, having astifl' central body of wood, or its equivalent, facedon both sides with leather, or' other equivalent yielding material, substantially as and for the reasons set forth.

- JAMES WOOL. Witnesses:

J. B. Gnosnr, FRANCIS GOULD. 

